Stoker plunger



Dec. 18, 1928. 1,696,088

C. E. HARRISON v STOKER PLUNGE R Filed March l9 1925 Patented Dec. 18, 1928.

UNITED STATES PATENT OFFICE.

CLIFFORD E. HARRISON, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR T0 AMERI- CAN ENGINEERING COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORA- TION OF PENNSYLVANIA.

STOKER PLUNGER.

Application filed March 19, 1925. Serial No. 16,717.

My invention relates to plunger devices, such for example, as are applicable to automatic stokers.

One object of my invention is to provide a fuel-feeding plunger which shall be particularly adapted to work in such portions of an automatic stoker as are sulqected to the greatest heat.

Another object of my invention is to provide a fuel-feeding plunger having a detach- "able, fuel-engaging end portion permitting replacement with a minimum expenditure of time and of moneywhen damaged'by the heat of the furnace.

A further object of my invention is to provide a fuel-engaging plunger provided with a tapered end portion, affording a maximum agitation of the fuel bed and downward movement of the clinkers with a minimum movement of the fuel bed toward the ash dischar e.

Ot1er objects and applications of my in vention, as well as details of construction and operation, will appear more fully hereinafter, when taken in connection with the accompanying drawing, wherein Fig. 1 is a perspective view of one form of embodiment of my invention;

Fig. 2 is a longitudinal sectional view taken on the line IIII of Fig. 1;

Fig. 3 is a transverse sectional view taken on the line III-III of Fig. 2; and

Fi 4 is a side elevational view of a modified etachable, fuel-engaging extension.

In the drawing is shown a plunger 1 particularly designed for use-in automatic stoker mechanism, though, of course, my invention is not to be strictly limited to such application. The plunger 1 comprises a hollow, tubular, main body portion 2 having at one end 3 a bifurcated projecting portion 4 adapted to be connected to a power. element (not of a pluralit of spaced, longitudinallv extending shou ders 11. y

The wall 7 of the main body portion 2 and the tongue 6 of the ram extension'f) are provided with aligned apertures or borings 12 and 13 for the removable reception of a wedging member 14. The wedging membenll also causes an outer side or face 15 of the wall 7 and an adjacent side 16 of the solid end portion or head 5 to be rigidly clamped together, formin one portion of a gas-tight joint 17, as shown in Fig. 2. The plunger 1 may be slidably supported in a stoker retort (not shown) at longitudinally spaced points 18 and 19.

The plunger 1 may be supportedvat 18 by means of an annular flange 20, which may be slightly extended longitudinally of the plunger, so as to embrace the meeting edge of the abutting faces 15 and 16 and the ad- Jacent outer surface of the removable end portion 5, as shown in Fig. 2, and thereby form the other portion of the gas-tight joint 17 The longitudinal extension of the flange 20 beyond the face 15 of the end wall 7 thus provides a recess which is adapted to'receive the adjacent end of the plunger extension 5. The plunger 1 may be supported at 19 by a plurality of spaced lugs 21 extending from the outer surface of the main body portion 2.

Should the end portion 5 of the plunger 1 be damaged during conditions of operation, as by burning, it is not necessary to discard the plunger 1 as a whole, as has heretofore been the practice, inasmuch as the damaged end portion 5 may be replaced, and this may be readily done by removing the wedging element 14.

The modified fuel-engaging extension of Fig; 4 differentiates over that of Figs. 1 to 3, inclusive, only in the fact that an upper side thereof is beveled as at 22, thus affording a greater agitation of the fuel bed and a greater tendency for the clink'ers to move clownwardly than the cylindrical end extension 5.

While I have shown only two embodiments of my invention, for the purpose of describing the same and illustrating its principles of construction and of operation, it is apparent that various changes and modifications may be made therein without departing from the spirit of my invention and I desire, therefore,

that only such limitations shall be imposed thereon as are indicated in the appended claims or as are demanded by the prior art.

I claim:

1. A plunger comprising a hollow main body portion provided with an end wall having a recess, an extension for said main body portion, said extension having a projecting shoulder disposed in said recess, said shoulder and said main body end wall being provided with registering borings, and a locking element positioned in said borings.

2. A stoker plunger comprising a plurality of sections, one section being recessed, a succeeding section being provided with a projecting portion having a plurality of raised shoulders providin supporting points for said portion in sai recess, said projecting portion and said first=mentioned section having registering apertures, and a wedging element disposed in said apertures adapted to lock said sections in abuttin relation.

3. A fuel-feeding plhnger comprising a plurality of sections, one section having a recess at one end thereof, a succeeding section being solid and provided with a projecting portion having a plurality of raised shoulders, said projecting portion being adapted to extend into said recess and provided with an aperture, said shoulders constituting supportin points for said rojecting portion, the ad acent end of said rst-mentioned section being provided with an aperture, and means disposed in said apertures for wedging together said successive sections.

4. A plunger comprising a main body 01'- tion provided with a recess in one end, a elengaging extension having a projecting tongue provided with a plurality of raised shoulders and adapted to be disposed in said recess, said tongue and the adjacent end of said main body portion having recesses adapted to receive a locking pin, a flange so formed on the end of said main body portion as to extend over the adjacent surface of said extension, and a plurality of lugs on said main body portion providing a plurality of supporting points for the plunger.

5. A plunger comprising a main body portion having an extension at one end adapted to be connected to an operating member, said plunger being provided with a removable extension at the opposite end thereof, the latter extension having a projecting tongue, the adjacent end of said main body portion having a recess adapted to receive said tongue, a \vedging element cooperating with apertures in said tongue and the last-mentioned end for detachably securing the parts together, and means providing raised bearing surfaces for said plunger.

6. A fuel-feeding plunger comprising a main body portion provided with an annular supporting flange having one edge projecting beyond the end of said body portion to form a recess adapted to receive one end of a plunger extension.

7. A fuel-feeding plunger section provided with a flange forming a shoulder overhanging one end thereof, said end being rovided with a recess, and a ram extension h shoulder disposed in said recess.

8. A fuel-feeding plunger section provided with a recessed end face, and an extension having a tongue pro'ecting into said recess, said plunger section having a flange providing a supporting surface therefor and overhanging the ad acent portion of said exten- SlOIl. a

9. A plunger body provided with a recessed end face, an extension havin a tongue projecting from an end face thereof into said recessed end face, means for securing said faces in abutting relation, and means for covering the meeting edge of said faces.

10. A fuel-feeding plunger being provided with a recessed end face, an extension having a shoulder rojectin from an end face thereof into said recesse end face, means for securing said faces in abutting relation whereby a tight joint may be formed therebetween, and means for so covering the meeting edge of said faces as to increase further the effectiveness of said joint,

11. A fuel-feeding plunger section provided with a recessed end face, an extension having a tongue projecting from a. face thereof into said recessed face, wedging means for securin said faces in abutting relation, and means or supporting said plunger section and for coverin the meeting edge of said faces.

12. A bo y portion having a recessed end face, an extension having a tongue projecting from an end face thereof into said recessed end face, means co-acting with said ton e and said body portion for wedging sai faces in abutting relation, and a flange extending from said body portion so as to cover the meeting edge of said faces.

13. A plunger comprising a body portion having a recessed end face, an extension having a cylindrical section provided with a tongue projecting from an end face thereof into sai recessed end face, means co-acting with said tongue and said body portion for wedging said faces in abutting relation, and a flange for covering said meeting edges and for providing a supporting surface for said plunger.

14. A plunger comprising a body'section provided with a recessed end portion, a fuelengaging extension having an apertured shoulder disposed in said recessed end portion, the latter having an aperture, locking means extending through said aperture into said 'apertured shoulder, and a flange extending from said body section so as to encircle the adjacent portion of said plunger extension.

CLIFFORD E. HARRISON.

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